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US6364236B1 - Belt tensionser coupling with a rotary drive unit - Google Patents

Belt tensionser coupling with a rotary drive unit Download PDF

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Publication number
US6364236B1
US6364236B1 US09/529,786 US52978600A US6364236B1 US 6364236 B1 US6364236 B1 US 6364236B1 US 52978600 A US52978600 A US 52978600A US 6364236 B1 US6364236 B1 US 6364236B1
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US
United States
Prior art keywords
coupling
pawl
rotor
knife
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/529,786
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English (en)
Inventor
Artur Föhl
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Individual
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Individual
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Filing date
Publication date
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Publication of US6364236B1 publication Critical patent/US6364236B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R2022/468—Reels with means to tension the belt in an emergency by forced winding up characterised by clutching means between actuator and belt reel

Definitions

  • the invention relates to a coupling between the rotor of a belt tensioner rotary drive and a drive shaft.
  • a coupling of this kind is known from German utility model 295 15 703.8.
  • the drive shaft coupled to the belt reel of a belt retractor carries an externally toothed coupling wheel, into the toothing of which two coupling pawls swivel-mounted on the rotor are engageable.
  • the coupling pawls are configured crowned at their end opposite the pawl tip and are supported over a large surface area by a correspondingly concavely shaped supporting surface area in a pocket bearing on the rotor to distribute the extremely high loads occurring in the coupling process both radially and circumferentially to a large supporting surface area.
  • the invention has the purpose of sophisticating this known coupling to the effect that the coupling process is accelerated and is already concluded when rotation of the rotor commences.
  • the coupling pawl is toggle-mounted on a knife-edge bearing on the rotor.
  • the invention is based on the idea that the large surface area contact between the coupling pawl and the supporting surface area which is favorable to distributing the load in the coupling process results in increased friction which delays the coupling process.
  • the friction is negligible so that no delay occurs in the coupling process.
  • distribution of the loads over a large supporting surface area is lastly achieved.
  • the coupling pawl once having attained its engagement position, is able to contact the supporting surface over a large surface area.
  • the knife-edge bearing formed more particularly by a pointed protuberance may be deformed under load so that the pawl comes into contact with the supporting surface area by its side facing away from the pawl tip.
  • the plastic deformation in the region of the knife-edge bearing is a desired effect by which the movement of the coupling pawl in contacting the toothing of the coupling wheel is damped. In the preferred embodiment this damping effect is enhanced by a plurality of additional deformation elements at the supporting surface area.
  • FIG. 1 is an exploded view of a belt tensioner rotary drive including the coupling
  • FIG. 2 is an axial section through the rotor as shown in FIG. 1;
  • FIG. 3 a is a detail view of the coupling on a magnified scale an d shown in the released condition
  • FIG. 3 b shows the coupling in the engaged condition
  • FIGS. 4 a and 4 b show a variant of the coupling in the released condition and engaged condition
  • FIGS. 5 to 7 show three variants of the coupling, each in the engaged condition.
  • the coupling is realized in the embodiment as described in a belt tensioner rotary drive applied laterally to a belt retractor.
  • Configured in a housing formed by a main body 10 and a cover plate 12 is a working chamber 14 for accommodating a rotor 16 .
  • the rotor 16 comprises three radial slots 18 , in each of which a lamella 20 is accommodated.
  • a drive shaft 22 carrying an externally toothed coupling wheel 24 is rotatively mounted in an axial hole 26 of the rotor 16 .
  • the drive shaft 22 comprises a splined, serrated or polygonal toothing 28 or the like for nonrotatively coupling to a belt reel (not shown).
  • pocket bearings 30 for accommodating a coupling pawl 32 .
  • three pocket bearings 30 are provided, of which at least two accommodate a coupling pawl 32 .
  • the pocket bearing 30 comprises a supporting surface area 34 on which a knife-edge bearing is formed by a pointed protuberance 36 .
  • This knife-edge bearing engages a corresponding notch 38 of the coupling pawl 32 .
  • the coupling pawl 32 is thus toggle-mounted on the supporting surface area 34 .
  • the coupling pawl 32 In the resting position as shown in FIG. 3 a the coupling pawl 32 is held by a flat section adjoining its pawl tip in contact with the supporting surface area 34 of the pocket bearing 30 by means of a return spring 40 .
  • the pawl tip is thus located at a defined spacing away from the periphery of the coupling wheel 24 .
  • the center of gravity S of the coupling pawl 32 is selected relative to the knife-edge bearing such that on rotation of the rotor 16 the coupling pawl 32 is deflected by mass inertia and urged into the external toothing on the periphery of the coupling wheel 24 .
  • a space 42 is formed for accommodating a sleeve 44 in which a gas generator capsule 46 is inserted.
  • the rotor 16 Since belt tensioning needs to be concluded within a few milliseconds, the rotor 16 experiences on commencement of its rotation an extremely high rotary acceleration, correspondingly high being the forces of mass inertia causing a deflection of the coupling pawls 32 in the direction of the coupling wheel 24 . These forces are supported by the mounting of the coupling pawls. Since both coupling pawls 32 are mounted on a knife-edge bearing, the friction forces are, however, negligible. Accordingly, the engaging movement of the coupling pawls 32 is not delayed by the influence of friction.
  • FIG. 3 b there is illustrated a coupling pawl 32 in the engaged condition in which the pawl tip positively engages the external toothing of the coupling wheel 24 .
  • the crowned end of the coupling pawl 32 is in contact over a large surface area with the correspondingly concavely shaped supporting surface area 34 .
  • the coupling pawls 32 are mutually staggered in the circumferential direction of the rotor 16 in such a way that should the tip of one coupling pawl clash with the tip of a tooth on the periphery of the coupling wheel 24 , the tip of another coupling pawl engages the gap between two successive teeth on the coupling wheel 24 .
  • FIGS. 4 a and 4 b there is illustrated an embodiment in which means are provided to damp the movement of the coupling pawl 32 in contacting the external toothing of the coupling wheel 24 .
  • a damping of this kind largely prevents the coupling pawl from bouncing back out of contact with the coupling wheel during the coupling process, as a result of which a further acceleration of the coupling process is achieved.
  • Arranged adjacent to the pointed protuberance 36 forming the knife-edge bearing and in the direction of rotation of the rotor behind the knife-edge bearing are two deformation elements, each of which is formed by a pointed protuberance 48 on the supporting surface area 34 .
  • the coupling pawl 32 in the engaged condition is located with its crowned end in contact with the tips of the protuberances 36 and 48 . Since the belt reel connected to the drive shaft 22 with the belt webbing wound thereon acts against the commencing rotary movement by its mass inertia, a high load acts on the coupling pawl 32 both radially and circumferentially. This load is absorbed by the supporting surface area 34 via the pointed protuberances 36 and 48 , resulting in a plastic deformation of these protuberances 36 and 48 to thus achieve the desired damping effect.
  • FIGS. 5 to 7 variants are illustrated differing from the embodiment as shown in FIGS. 4 a and 4 b merely by the shape and arrangement of the pointed protuberances which form the knife-edge bearing and the deformation elements as well as by the shape of the coupling pawls being adapted under load.
  • the protuberances are configured less pointed.
  • the end of the coupling pawl 32 supported by the pointed protuberances is not crowned convex but concave.
  • the tips of the protuberances are located in a single plane, and the supported end of the coupling pawl 32 is correspondingly plane.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Pulleys (AREA)
US09/529,786 1997-10-28 1997-10-28 Belt tensionser coupling with a rotary drive unit Expired - Fee Related US6364236B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29719143U 1997-10-28
DE29719143U DE29719143U1 (de) 1997-10-28 1997-10-28 Kupplung für einen Gurtstraffer mit Drehantrieb
PCT/EP1998/006838 WO1999021740A1 (fr) 1997-10-28 1998-10-28 Accouplement pour tendeur de courroie avec entrainement en rotation

Publications (1)

Publication Number Publication Date
US6364236B1 true US6364236B1 (en) 2002-04-02

Family

ID=8047853

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/529,786 Expired - Fee Related US6364236B1 (en) 1997-10-28 1997-10-28 Belt tensionser coupling with a rotary drive unit

Country Status (10)

Country Link
US (1) US6364236B1 (fr)
EP (1) EP1024981B1 (fr)
JP (1) JP2002500120A (fr)
KR (1) KR20010031455A (fr)
CN (1) CN1097533C (fr)
CZ (1) CZ295661B6 (fr)
DE (2) DE29719143U1 (fr)
ES (1) ES2177081T3 (fr)
WO (1) WO1999021740A1 (fr)
ZA (1) ZA989831B (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020056602A1 (en) * 2000-11-14 2002-05-16 Rotis S.R.L. Freewheel with reduced wear and noisiness
US6681914B2 (en) * 2000-12-15 2004-01-27 Trw Occupant Restraint Systems Gmbh & Co. Kg Coupling for a belt retractor with a belt tensioner
US20040075008A1 (en) * 2002-07-11 2004-04-22 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing retractor
US20040075009A1 (en) * 2002-07-11 2004-04-22 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing retractor
US20040149852A1 (en) * 2003-01-31 2004-08-05 Trw Occupant Restraint Systems Gmbh & Co. Kg Belt spool for a safety belt retractor
WO2005087555A1 (fr) * 2004-03-09 2005-09-22 Takata Corporation Dispositif de tension de ceinture
US20060021837A1 (en) * 2004-07-27 2006-02-02 John Kimes Overrunning clutch
US20060021840A1 (en) * 2004-07-27 2006-02-02 John Kimes Ratcheting one-way clutch having rockers
US20060237568A1 (en) * 2004-03-09 2006-10-26 Takata Corporation Seat belt tensioner
US20060249613A1 (en) * 2004-03-09 2006-11-09 Takata Corporation Seat belt tensioner
US20070085319A1 (en) * 2004-03-09 2007-04-19 Takata Corporation Seat-belt tensioner
US7207913B2 (en) 2003-07-18 2007-04-24 Dade Behring Inc. Bi-directional drivebelt tensioning device
WO2011040615A1 (fr) * 2009-09-30 2011-04-07 Ashimori Industry Co., Ltd. Rétracteur de ceinture de sécurité

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19844092C2 (de) * 1998-09-25 2000-08-10 Breed Automotive Tech Kupplung zur Übertragung eines Drehmoments auf eine Gurtspule eines Sicherheitsgurtaufrollers
JP2002005201A (ja) * 2000-06-20 2002-01-09 Nsk Warner Kk ラチェット型ワンウェイクラッチ
CA2462247C (fr) 2001-10-03 2009-09-08 Galileo Mobility Instruments Ltd. Systeme de traction adaptable d'un vehicule
JP5355407B2 (ja) * 2006-10-14 2013-11-27 オートリブ ディベロップメント エービー 様々な機能位置で異なる荷重伝達を有するシートベルトリトラクタ
WO2008081675A1 (fr) * 2006-12-28 2008-07-10 Autoliv Development Ab Dispositif de ceinture de sécurité

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE375047C (de) 1921-07-01 1923-05-04 Auto Debrayage T L Sa Klinkenschaltwerk fuer Motorwagen, bei dem die Schaltklinken in Aussparungen einer auf der Motorwelle sitzenden Scheibe angeordnet sind
US2226247A (en) 1938-09-28 1940-12-24 Lesage Alfred Freewheel locking device, more particularly for the hub of bicycles
GB793920A (en) 1955-11-22 1958-04-23 Roamer Watch Co Sa Improvements in or relating to freewheel coupling mechanisms
EP0737606A1 (fr) 1995-04-11 1996-10-16 TRW Occupant Restraint Systems GmbH Enrouleur de ceinture pour un système de ceinture de sécurité de véhicule
US5730384A (en) * 1995-01-19 1998-03-24 Trw Occupant Restraint Systems Gmbh Coupling between the belt drum of a belt retractor and a belt pretensioner rotary drive
US5918717A (en) * 1996-09-27 1999-07-06 Foehl; Artur Rotary drive apparatus for a belt tensioner

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29515703U1 (de) 1995-10-02 1996-02-08 Föhl, Artur, 73614 Schorndorf Drehantriebsvorrichtung für einen Gurtstraffer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE375047C (de) 1921-07-01 1923-05-04 Auto Debrayage T L Sa Klinkenschaltwerk fuer Motorwagen, bei dem die Schaltklinken in Aussparungen einer auf der Motorwelle sitzenden Scheibe angeordnet sind
US2226247A (en) 1938-09-28 1940-12-24 Lesage Alfred Freewheel locking device, more particularly for the hub of bicycles
GB793920A (en) 1955-11-22 1958-04-23 Roamer Watch Co Sa Improvements in or relating to freewheel coupling mechanisms
US5730384A (en) * 1995-01-19 1998-03-24 Trw Occupant Restraint Systems Gmbh Coupling between the belt drum of a belt retractor and a belt pretensioner rotary drive
EP0737606A1 (fr) 1995-04-11 1996-10-16 TRW Occupant Restraint Systems GmbH Enrouleur de ceinture pour un système de ceinture de sécurité de véhicule
US5794875A (en) 1995-04-11 1998-08-18 Trw Occupant Restraint Systems Gmbh Belt retractor for a vehicle safety belt system
US5918717A (en) * 1996-09-27 1999-07-06 Foehl; Artur Rotary drive apparatus for a belt tensioner

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020056602A1 (en) * 2000-11-14 2002-05-16 Rotis S.R.L. Freewheel with reduced wear and noisiness
US6681914B2 (en) * 2000-12-15 2004-01-27 Trw Occupant Restraint Systems Gmbh & Co. Kg Coupling for a belt retractor with a belt tensioner
US7108284B2 (en) 2002-07-11 2006-09-19 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing retractor
US20040075008A1 (en) * 2002-07-11 2004-04-22 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing retractor
US20040075009A1 (en) * 2002-07-11 2004-04-22 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing retractor
US20060273212A1 (en) * 2002-07-11 2006-12-07 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing retractor
US7083136B2 (en) * 2002-07-11 2006-08-01 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing retractor
US20040149852A1 (en) * 2003-01-31 2004-08-05 Trw Occupant Restraint Systems Gmbh & Co. Kg Belt spool for a safety belt retractor
US7207913B2 (en) 2003-07-18 2007-04-24 Dade Behring Inc. Bi-directional drivebelt tensioning device
US7905441B2 (en) * 2004-03-09 2011-03-15 Takata Corporation Seat belt tensioner
US7607604B2 (en) * 2004-03-09 2009-10-27 Takata Corporation Seat belt tensioner
US20060237568A1 (en) * 2004-03-09 2006-10-26 Takata Corporation Seat belt tensioner
US20060249613A1 (en) * 2004-03-09 2006-11-09 Takata Corporation Seat belt tensioner
US20060249612A1 (en) * 2004-03-09 2006-11-09 Takata Corporation Seat belt tensioner
US8210460B2 (en) 2004-03-09 2012-07-03 Takata Corporation Seat belt tensioner
US20070085319A1 (en) * 2004-03-09 2007-04-19 Takata Corporation Seat-belt tensioner
WO2005087555A1 (fr) * 2004-03-09 2005-09-22 Takata Corporation Dispositif de tension de ceinture
US7455156B2 (en) 2004-07-27 2008-11-25 Ford Global Technologies, Llc Overrunning clutch
US7455157B2 (en) * 2004-07-27 2008-11-25 Ford Global Technologies, Llc Ratcheting one-way clutch having rockers
US20060021837A1 (en) * 2004-07-27 2006-02-02 John Kimes Overrunning clutch
US20060021840A1 (en) * 2004-07-27 2006-02-02 John Kimes Ratcheting one-way clutch having rockers
GB2424046A (en) * 2005-03-10 2006-09-13 Ford Global Tech Llc One-way clutch with reaction surfaces
GB2424046B (en) * 2005-03-10 2010-11-24 Ford Global Tech Llc Overrunning clutch
DE102006010784B4 (de) * 2005-03-10 2015-10-29 Ford Global Technologies, Llc Freilaufkupplung
WO2011040615A1 (fr) * 2009-09-30 2011-04-07 Ashimori Industry Co., Ltd. Rétracteur de ceinture de sécurité
AU2010301373B2 (en) * 2009-09-30 2013-04-18 Ashimori Industry Co., Ltd. Seatbelt retractor
KR101330689B1 (ko) * 2009-09-30 2013-11-19 아시모리고교 가부시키가이샤 시트 벨트용 리트랙터
US8727256B2 (en) 2009-09-30 2014-05-20 Ashimori Industry Co., Ltd. Seatbelt retractor

Also Published As

Publication number Publication date
ES2177081T3 (es) 2002-12-01
CZ295661B6 (cs) 2005-09-14
ZA989831B (en) 1999-05-05
KR20010031455A (ko) 2001-04-16
CN1097533C (zh) 2003-01-01
DE59804001D1 (de) 2002-06-06
JP2002500120A (ja) 2002-01-08
DE29719143U1 (de) 1998-02-26
CZ20001576A3 (cs) 2000-12-13
EP1024981A1 (fr) 2000-08-09
EP1024981B1 (fr) 2002-05-02
CN1278218A (zh) 2000-12-27
WO1999021740A1 (fr) 1999-05-06

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REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

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Effective date: 20060402